The Case IH STX440 tractor engine horsepower is 440 hp | 328.1 kW, PTO horsepower is 454.23 hp | 338.7 kW, and the drawbar horsepower is 371.35 hp | 276.9 kW.
Engine HP440 hp | 328.1 kW
PTO HP454.23 hp | 338.7 kW
Drawbar HP371.35 hp | 276.9 kW
PTO Transfer103.2%
Torque1650 lb-ft | 2237.4 Nm
Displacement912 ci | 14.9 L
Case IH STX440 Horsepower Specs
Engine horsepower
440 hp | 328.1 kW
PTO horsepower tested
454.23 hp | 338.7 kW
Drawbar horsepower tested
371.35 hp | 276.9 kW
Case IH STX440 Useful Horsepower Calculations
PTO-to-engine power transfer
103.2% of engine hp reaches the PTO
Drawbar-to-engine power transfer
84.4% of engine hp reaches the drawbar
Drawbar-to-PTO power ratio
81.8% drawbar hp vs PTO hp
Engine size per PTO horsepower
2 ci per PTO hp
PTO horsepower per liter
30.5 PTO hp per L
Engine size per engine horsepower
2.1 ci per engine hp
Engine horsepower per liter
29.5 engine hp per L
Torque per PTO horsepower
3.6 lb-ft per PTO hp
Rated speed per PTO horsepower
4.4 rpm per PTO hp
Case IH STX440 Engine Specs
Engine type
turbocharged aftercooled diesel
Displacement
912 ci | 14.9 L
Bore and stroke
5.394×6.654 inches | 137 x 169 mm
Compression
16.5:1
Rated RPM
2000
Torque
1650 lb-ft | 2237.4 Nm
Torque RPM
1400
Case IH STX440 Fuel, Cooling, Starting & Service Specs
Starter volts
12
Battery volts
12
Case IH STX440 Horsepower Comparison Charts
Engine horsepower comparison
This model
440 hp
Average
210 hp
Low
120 hp
High
380 hp
PTO horsepower comparison
This model
454.2 hp
Average
175 hp
Low
100 hp
High
320 hp
Drawbar horsepower comparison
This model
371.4 hp
Average
150 hp
Low
85 hp
High
280 hp
Displacement comparison
This model
912 ci
Average
520 ci
Low
360 ci
High
750 ci
Torque comparison
This model
1,650 lb-ft
Average
700 lb-ft
Low
350 lb-ft
High
1,250 lb-ft
Rated RPM comparison
This model
2,000 rpm
Average
2,100 rpm
Low
1,600 rpm
High
2,500 rpm
Engine size per PTO HP
This model
2 ci/hp
Average
3.3 ci/hp
Low
2 ci/hp
High
5.2 ci/hp
Benchmarks use practical low, average and high ranges for the large ag tractor category. Use the operator manual and actual engine/tractor configuration before sizing implements or judging working power.
Case IH STX440 Horsepower FAQ
How much horsepower does the Case IH STX440 have?
The listed engine output is 440 hp, above the 210 hp benchmark average. That is a higher-power result, so ballast, tire setup and implement width matter if you want to use the full 440 hp.
How much PTO horsepower does the Case IH STX440 have?
The listed PTO output is 454.2 hp, above the 175 hp benchmark average. That is the number to use for mowers, balers, augers, pumps and other PTO tools that need up to about 454.2 hp.
How much drawbar horsepower does the Case IH STX440 have?
The listed drawbar output is 371.4 hp, above the 150 hp benchmark average. That makes the 371.4 hp drawbar number more useful than engine hp for tillage and heavy pulling.
How much engine power reaches the PTO on the Case IH STX440?
The PTO-to-engine transfer works out to 103.2%, from 440 engine hp to 454.2 PTO hp. That is a strong transfer figure when the two specs are from the same configuration.
How efficient is the Case IH STX440 for pulling work?
The drawbar-to-engine transfer is about 84.4%, from 440 engine hp to 371.4 drawbar hp. That is a strong pulling-efficiency number if the specs come from the same test setup.
Is the Case IH STX440 better judged by PTO hp or drawbar hp?
The drawbar output is about 81.8% of PTO output, comparing 371.4 drawbar hp with 454.2 PTO hp. That helps separate pulling ability from PTO implement ability.
How big is the Case IH STX440 engine?
The engine displacement is 912 ci, above the 520 ci benchmark average. Bigger displacement can help low-rpm pull and load-holding feel.
Is the Case IH STX440 engine stressed for its PTO horsepower?
The engine has about 2 cubic inches per PTO hp, using 912 ci and 454.2 PTO hp. That is a smaller-displacement, higher-output style result.
How much PTO horsepower per liter does the Case IH STX440 make?
The output density is about 30.5 PTO hp per liter, using 454.2 PTO hp and 14.9 L of displacement. Higher hp/L means more output squeezed from each liter; lower hp/L usually means a more relaxed engine tune.
Official information note
Horsepower and engine specs can vary by year, market, engine option, fuel system, test standard and tractor configuration. Check the operator manual, spec plate, parts book and official caseih.com website before buying parts, sizing implements or making repair decisions.
